title: Development of highly sensitive and specific HPLC assay for plasma morphine using direct injection technique and post-column derivatization.
abstract: An extremely simple, rapid and reproducible analytical method was developed for the determination of morphine in human plasma using a high performance liquid chromatography utilizing a column-switching technique and protein-coated precolumn. Morphine from plasma (500 microL) was preconcentrated on the protein-coated pre-column without sample pre-treatment. This column acted at the same time as a clean up device. The drug was transferred on-line to the analytical column followed by post-chromatographic derivatization and fluorimetric detection. Post-column derivatization was based on the oxidative dimerization of morphine to fluorescent pseudomorphine by potassium hexacyanoferrate (III). The average morphine recoveries over a concentration range of 10 to 100 ng/mL ranged from 94.84 to 100.70%, and relative standard deviations ranged from 1.36 to 2.13%.
authors.affiliation: Faculty of Pharmacy, Assiut University, Egypt.
authors.forename: S
authors.initials: S
authors.lastname: Emara
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D005292:Ferricyanides; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009020:Morphine / Q000097:blood*; D009022:Morphine Derivatives / Q000097:blood; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence
chemical_list: D005292:Ferricyanides; D009022:Morphine Derivatives; D009020:Morphine; C028033:potassium ferricyanide